| (19) |
 |
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(11) |
EP 0 833 476 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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17.02.1999 Bulletin 1999/07 |
| (43) |
Date of publication A2: |
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01.04.1998 Bulletin 1998/14 |
| (22) |
Date of filing: 26.09.1997 |
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| (84) |
Designated Contracting States: |
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AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
| (30) |
Priority: |
26.09.1996 US 721149
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| (71) |
Applicant: Rockwell International Corporation |
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Costa Mesa, CA 92626 (US) |
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| (72) |
Inventor: |
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- Olafsson, Sverrir
170 Seltjarnarnes (IS)
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| (74) |
Representative: Wagner, Karl H., Dipl.-Ing. et al |
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WAGNER & GEYER
Patentanwälte
Gewürzmühlstrasse 5
80538 München
80538 München (DE) |
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| |
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| (54) |
Fast resynchronization system for high-speed data transmission |
(57) A system for resynchronizing the timing and carrier phases of a modem receiver signal
to enable the receiver to quickly reacquire the timing phase and the carrier phase,
and thereby restart the demodulation process. The system provides accurate estimates
of the timing and carrier phases, as well as a gain correction factor to provide for
proper alignment for decoding. The discrete Fourier transform of the received signal
is multiplied by the complex conjugate of the discrete Fourier transform of the transmitted
signal to produce estimates of the desired phases. Gain control and carrier phase
control are performed to determine corresponding error signals to adapt the resultant
estimated timing and carrier phases, and gain correction.